圆加载

来源：互联网发布：中南大学网络教学平台编辑：程序博客网时间：2024/05/18 00:10

import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.util.Timer;

public class MainActivity extends AppCompatActivity {
private Button btnAdd;
private ProgressView pv;

private static final int FLAG = 0x123;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case FLAG:
                    int progress = pv.getProgress();
                    progress += 10;
                    if (progress > 100) {
                        progress = 0;
                    }
                    pv.setProgress(progress);
                    handler.sendEmptyMessageDelayed(FLAG, 1000);
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

btnAdd = (Button) findViewById(R.id.btn_add);

pv = (ProgressView) findViewById(R.id.pv_data);

        btnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                int progress = pv.getProgress();
//                progress += 30;
//                pv.setProgress(progress);
                handler.sendEmptyMessageDelayed(FLAG, 1000);
            }
        });

pv.setListener(new ProgressView.ProgressUpdateListener(){

            @Override
            public void onProgressUpdated(int progress) {
                if (progress >= 100) {
//                    handler.remove;
                    startActivity(new Intent(MainActivity.this, ScanActivity.class));

                }
            }
        });
    }

    @Override
    protected void onStop() {
        super.onStop();
        handler.removeMessages(FLAG);
    }
}

-------------------------------------------------------------------------------------------

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

/**
* Created by WuXirui
* Create Time: 2017/11/4
* Description:
*/

public class ProgressView extends View {
private ProgressUpdateListener listener;

    interface ProgressUpdateListener {
        void onProgressUpdated(int progress);
    }

    public void setListener(ProgressUpdateListener listener) {
        this.listener = listener;
    }

private int progress = 0;

    public ProgressView(Context context) {
        super(context);
    }

    public ProgressView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public ProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public int getProgress() {
        return progress;
    }

    public void setProgress(int progress) {
        this.progress = progress;
        postInvalidate();
        if (listener != null) {
            listener.onProgressUpdated(progress);
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int width = getWidth();
        int height = getHeight();

// 绘图范围
int react = Math.min(width, height);

// 半径
int radius = react / 2;

        // 绘制最外层的大圆
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.GREEN);
        paint.setStyle(Paint.Style.STROKE);

canvas.drawCircle(radius, radius, radius, paint);

        paint.reset();
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(20);
        paint.setColor(Color.RED);
        // 画扇形
        canvas.drawArc(10, 10, react-10, react-10, -90, progress*360/100, true, paint);

        // 画内层的小圆
        paint.reset();
        paint.setColor(Color.WHITE);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.drawCircle(radius, radius, radius - 20, paint);

        // 画进度文字
        paint.reset();
        paint.setColor(Color.BLUE);
        paint.setTextSize(40);

        Rect rect = new Rect();
        paint.getTextBounds(progress + "", 0, String.valueOf(progress).length(),
                rect);
        int textWidth = rect.width();
        int textHeight = rect.height();

canvas.drawText(progress + "", radius-textWidth/2, radius-textHeight/2, paint);
}

public class ScanActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
    }
}

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